Unreal Engine Issues
Unreal Engine Issues
Lighting Build Fails With High Density Foliage
UE - World Creation - Worldbuilding Tools - Foliage - Jan 16, 2018Trying to build lighting on a map with high density foliage will fail lighting build or cause the editor to crash. This occurs in 4.15, 4.16, 4.17, and 4.18. There have been multiple reports of this ...
Chained physics constraints do not work correctly when one constraint is limited
UE - Simulation - Physics - Aug 12, 2017A chain of physics constraints that includes a physics constraint that is set to Limited does not work correctly. When collision occurs, the attached actors start moving erratically. Regression?: N ...
GAS: Ability that destroys owning actor on activate causes crashes due to ABILITYLIST_SCOPE_LOCK
UE - Gameplay - Gameplay Ability System - Oct 31, 2023A GameplayAbility that destroys its owning actor inside ActivateAbility() causes a crash, because actor destruction will modify the ability list but ActivateAbility() is called within an ABILITYLIST ...
[CrashReport] UE4Editor_CoreUObject!TFastReferenceCollector<1,FGCReferenceProcessor<1>,FGCCollector<1>,FGCArrayPool,0>::ProcessObjectArray()
UE - Foundation - Core - UObject - Jul 19, 2017This is a common crash affecting users in 4.16. Over 100 users have been affected, although they have not provided additional information. Source Context 469 TokenStreamIndex++; 47 ...
Sequencer animations using Skeletal Mesh Pose don't play properly if following another sequence with an animation using Keep State
UE - Anim - Sequencer - Feb 20, 2019The bug affects skeletal mesh animations when played in sequencer with AnimBP after another animation which was set to Keep State. This is a follow-up to [Link Removed]. Two animations now play cor ...
Callling "Get[AxisMapping]" or adding AxisMapping Event node in blueprint will break code input implementation for that axis mapping
UE - Gameplay - Input - Aug 17, 2016When character input is defined in code, adding a call to the Get[AxisMapping] node in blueprints causes input for the specific mapping to fail. Note: This only affects code based input, Blueprint ...
BSP brushes get Clipped or Disappear relative to the Surface Normals of a nearby Brush when Deleting/Flipping Faces
UE - LD & Modeling - Modeling Tools - BSP - May 1, 2017While testing this issue it was interesting to discover how the surrounding BSP's were affected. They seemed to clip/disappear according to the surface normals of the deleted brushes. There is a si ...
Disabling the Paper 2D plugin causes a packaged project to not open
UE - Foundation - Cpp Tools - Automation Tool - Jun 19, 2017When working in a project that is in 4.16, disabling the Paper2D plugin causes a packaged version of the project to not open. This issue is different from previous versions as disabling the plugin i ...
Missing Triangles on scaled MetaHuman assets with Nanite enabled
UE - Graphics Features - Nanite - Feb 19, 2025Additional information: only happens when all three conditions are true: the camera is very close to the character, the MH is Nanite, and a scaled mocap animation is appliedmaterial is opaque, shows ...
Mouse dragging cursor accelerates significantly on Mac
Tools - Jan 18, 2017This also occurs in 4.14.3 This does not occur on Windows. Could not get this issue to reproduce while recording the screen with quicktime player, but if you experience it in person it really feel ...